Mobail_App/NewPage1.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MobailApp.NewPage1"
             Title="NewPage1">
    <VerticalStackLayout VerticalOptions="Center">
        <Label
            Margin="0,0,0,30"
            Text="Новая страничка"
            FontSize="30"
            VerticalOptions="Center" 
            HorizontalOptions="Center" />
        <Button
            x:Name="CounterBtn"
            Text="Click me" 
            SemanticProperties.Hint="Counts the number of times you click"
            Clicked="OnCounterClicked"
            HorizontalOptions="Fill" />
    </VerticalStackLayout>
</ContentPage>